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Hemoglobinopathy

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is endemic. Malaria parasites live inside red blood cells, but subtly disturb normal cellular function. In patients predisposed for rapid clearance of red blood cells, this may lead to early destruction of cells infected with the parasite and increased chance of survival for the carrier of the trait.
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Hb structural variants are qualitative defects that cause a change in the structure (primary, secondary, tertiary, and/or quaternary) of the Hb molecule. The majority of Hb variants do not cause disease and are most commonly discovered either incidentally or through newborn screening. A subset of Hb
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Nabarrete, J. M.; Pereira, A. Z.; GarĂłfolo, A.; Seber, A.; Venancio, A. M.; Grecco, C. E.; Bonfim, C. M.; Nakamura, C. H.; Fernandes, D.; Campos, D. J.; Oliveira, F. L.; Cousseiro, F. K.; Rossi, F. F.; Gurmini, J.; Viani, K. H.; Guterres, L. F.; Mantovani, L. F.; Darrigo Lg, Junior; Albuquerque, M.
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Fetal Hb (HbF) is produced from approximately eight weeks of gestation through birth and constitutes approximately 80 percent of Hb in the full-term neonate. It declines during the first few months of life and, in the normal state, constitutes <1 percent of total Hb by early childhood. HbF is
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Change in oxygen affinity: High or low oxygen affinity Hb molecules are more likely than normal to adopt the relaxed (R, oxy) state or the tense (T, deoxy) state, respectively. High oxygen affinity variants (R state) cause polycythemia (e.g., Hb Chesapeake, Hb Montefiore). Low oxygen affinity
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Thalassemias: Thalassemias are quantitative defects that lead to reduced levels of one type of globin chain, creating an imbalance in the ratio of alpha-like chains to beta-like chains. As noted above, this ratio is normally tightly regulated to prevent excess globin chains of one type from
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accumulating. The excess chains that fail to incorporate into Hb form non-functional aggregates that precipitate within the RBC. This can lead to premature RBC destruction in the bone marrow (beta thalassemia) and/or in the peripheral blood (alpha thalassemia). Types:
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This is how abnormal hemoglobin variants are isolated and identified using these two methods. For example, a Hgb G-Philadelphia would migrate with S on alkaline electrophoresis and would migrate with A on acid electrophoresis, respectively
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Natarajan K, Townes TM, Kutlar A. Disorders of hemoglobin structure: sickle cell anemia and related abnormalities. In: Williams Hematology, 8th ed, Kaushansky K, Lichtman MA, Beutler E, et al. (Eds), McGraw-Hill, 2010.
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to the tissues: This is due to the peculiar cooperation of the globin chains that allows the molecule to take in more oxygen where there is increased oxygen and to release oxygen in low concentration of
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Methemoglobinemia: The iron in the heme portion of hemoglobin is easily oxidised and this reduces the ability of hemoglobin to bind oxygen. More deoxygenated hemoglobin are formed and the blood becomes
222:(HbA) is the predominant Hb in children by six months of age and onward; it constitutes 96-97% of total Hb in individuals without a hemoglobinopathy. It is composed of two α globins and two β globins (α 1110:
Monga I, Kaur K, Dhanda S (March 2022). "Revisiting hematopoiesis: applications of the bulk and single-cell transcriptomics dissecting transcriptional heterogeneity in hematopoietic stem cells".
114:, which are caused by an underproduction of otherwise normal hemoglobin molecules. The main structural hemoglobin variants are HbS, HbE and HbC. The main types of thalassemia are 397:
Copy number variation (e.g., deletion, duplication, insertion) is also a common genetic cause of Hb disorders, and complex rearrangements and globin gene fusions can also occur.
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Huisman TH. The structure and function of normal and abnormal haemoglobins. In: Baillière's Clinical Haematology, Higgs DR, Weatherall DJ (Eds), W.B. Saunders, London 1993. p.1.
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Forman SJ, Negrin RS, Antin JH, Appelbaum FR. Thomas' hematopoietic cell transplantation: stem cell transplantation. 5th ed. Vol. 2. New Jersey: Wiley-Blackwell; 2016. p.1416.
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is a minor adult Hb that normally accounts for approximately 2.5–3.5% of total Hb from six months of age onward. It is composed of two α globins and two δ (delta) globins (α
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The two conditions may overlap because some conditions which cause abnormalities in hemoglobin proteins also affect their production. Some hemoglobin variants do not cause
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Haemoglobin variant are not necessarily pathological. For example, haemoglobin Valletta and haemoglobin Marseille are two haemoglobin variants which are non-pathological
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Joseph Bonavetura and Austin Riggs, March 1968, "Hemoglobin Kansas, A Human Hemoglobin with a Neutral Amino Acid Substitution and an Abnormal Oxygen Equilibrium",
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composed of two pairs of globin chains, each of which contains one α (alpha) chain and one β (beta) chain. Each globin chain is associated with an iron-containing
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is a form of Hb that contains the ferric form of iron. The affinity for oxygen of ferric iron is impaired. The binding of oxygen to methaemoglobin results in an
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residues, can produce M-hemoglobin, in which the iron atom in heme is oxidized from the ferrous (Fe) state to the ferric (Fe) state, with resultant
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In general a sickling test is performed on abnormal hemoglobins migrating in the S location to see if the hemoglobin precipitates in solution of
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In general on alkaline electrophoresis in order of increasing mobility are hemoglobins A2, E=O=C, G=D=S=Lepore, F, A, K, J, Bart's, N, I, and H.
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state in combination with another structural variant or a thalassemia mutation. When clinical consequences occur, they may include anemia due to
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Percy, M. J.; Butt, N. N.; Crotty, G. M.; Drummond, M. W.; Harrison, C.; Jones, G. L.; Turner, M.; Wallis, J.; McMullin, M. F. (2009).
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due to alterations in the oxygen affinity of the abnormal Hb. Common examples of hemoglobin variants associated with hemolysis include
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Oxidation of heme iron: Mutations of the heme binding site, particularly those affecting the conserved proximal or distal
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Change in physical properties (solubility): Common beta globin mutations can alter the solubility of the Hb molecule: HbS
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methods; however, DNA-based methods may be required for variants with ambiguous or unusual results from protein analysis.
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There are two main groups: abnormal structural hemoglobin variants caused by mutations in the hemoglobin genes, and the
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affinity for oxygen in the remaining heme sites that are in ferrous state within the same tetrameric haemoglobin unit.
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to produce water and carbon dioxide. The carbon dioxide is mopped up by hemoglobin to favor this reversible reaction.
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In general on acid electrophoresis in order of increasing mobility are hemoglobins F, A=D=G=E=O=Lepore, S, and C.
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Felfly H, Haddad GG (2014). "Hematopoietic stem cells: potential new applications for translational medicine".
896:"Severe hemolytic anemia associated with the homozygous state for an unstable hemoglobin variant (Hb Bushwick)" 1892: 1743: 593:. This assists in the regulation of vascular reaction in times of stress as experienced during inflammation. 618:
Unstable hemoglobins: Red blood cells are easily destroyed under stress and hemolysis occurs with possible
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Greene DN, Vaughn CP, Crews BO, Agarwal AM (January 2015). "Advances in detection of hemoglobinopathies".
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Reduced protein stability (instability): Unstable Hb variants are mutations that cause the Hb molecule to
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due to reduced life span of the red cells of reduced production of the cells, e.g., HbS, HbC and HbE.
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I.; Brumatti, M.; Neves, M. A.; Duran, N.; Villela, N. C.; Zecchin, V. G.; Fernandes, J. F. (2021).
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Pathology and organic structural abnormalities may lead to any of the following disease processes:
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The specific α and β chains that are incorporated into Hb are highly regulated during development:
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Wilcox I, Boettger K, Greene L, Malek A, Davis L, Steinberg MH, Luo HY, Chui DH (January 2009).
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Increased oxygen affinity: The red blood cells do not release their oxygen content readily in
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from the tissues to the lungs: The end product of tissue metabolism is acidic which increases
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Srivastava, P.; Kaeda, J. S.; Roper, D.; Vulliamy, T. J.; Buckley, M.; Luzzatto, L. (1995).
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Weatherall DJ. The New Genetics and Clinical Practice, Oxford University Press, Oxford 1991.
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The major functional consequences of Hb structural variants can be classified as follows:
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Category:Hereditary hemolytic anemias Category:Disorders of globin and globulin proteins
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Eaton, William A.; Hofrichter, James (1990). "Sickle Cell Hemoglobin Polymerization".
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blood to replicate inside a patient and to produce normal blood cells. It may be
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Hb Gower-1, composed of two ζ (zeta) globins and two ε (epsilon) globins, i.e., ζ
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therefore needs to produce more red blood cells and there is polycythemia.
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and disappear around the eighth week of gestation as they are replaced by
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a condition caused by elevated levels of methemoglobin in the blood.
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Hb Portland, composed of two ζ globins and two γ (gamma) globins (ζ
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Clinica Chimica Acta; International Journal of Clinical Chemistry
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Hb Gower-2, composed of two α globins and two ε globins (α
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Some hemoglobinopathies (and also related diseases like
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variants can cause severe disease when inherited in the
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Red blood cells from a person with sickle cell trait
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Red blood cells from a person with beta thalassemia
62: 40: 35: 1056:. National Center for Biotechnology Information 162:are expressed as early as four to six weeks of 208:composed of two α globins and two Îł globins (α 1460: 87:is the medical term for a group of inherited 8: 1609:Glucose-6-phosphate dehydrogenase deficiency 913:10.1182/blood.V86.5.1977.bloodjournal8651977 578:in solution. The hydrogen ions combine with 534:glucose-6-phosphate dehydrogenase deficiency 1965:Hereditary persistence of fetal hemoglobin 1726: 1590: 1528: 1519: 1490: 1467: 1453: 1445: 1334: 681:Centers for Disease Control and Prevention 103:and, in most cases, they are inherited as 73: 49: 32: 1917:Mean corpuscular hemoglobin concentration 1739:Warm antibody autoimmune hemolytic anemia 1313: 1303: 1262: 1232: 1230: 1202: 1200: 1171: 1004: 963: 911: 797:"A Syllabus of Human Hemoglobin Variants" 717: 706:Bulletin of the World Health Organization 650:(the patient's own stem cells are used), 27:Any of various genetic disorders of blood 700:Weatherall, D. J.; Clegg, J. B. (2001). 325:Hb can attach to the inner layer of the 1237:Park B, Yoo KH, Kim C (December 2015). 933: 931: 667: 636:Hematopoietic stem cell transplantation 493:Hemoglobin variants can be detected by 306:when deoxygenated and HbC crystallizes. 654:(the stem cells come from a donor) or 1292:International Journal of Cell Biology 329:of the red blood cell (RBC) and form 7: 1626:triosephosphate isomerase deficiency 1164:10.31744/einstein_journal/2021AE5254 742:"Hemoglobinopathies and Thalassemia" 249:Classification of hemoglobinopathies 1781:paroxysmal nocturnal hemoglobinuria 1749:Donath–Landsteiner hemolytic anemia 1037:The Journal of Biological Chemistry 746:medicalassistantonlineprograms.org/ 489:Electrophoretic migration patterns 341:(e.g., Hb Kansas, Hb Beth Israel). 25: 1790:Microangiopathic hemolytic anemia 1761:Mixed autoimmune hemolytic anemia 1821:Hemolytic disease of the newborn 1112:Briefings in Functional Genomics 803:. Pennsylvania State University 1754:Paroxysmal cold hemoglobinuria 993:American Journal of Hematology 1: 863:10.1016/S0065-3233(08)60287-9 851:Advances in Protein Chemistry 677:"Hemoglobinopathies Research" 141:Normal human hemoglobins are 137:Hemoglobin structural biology 1705:Southeast Asian ovalocytosis 1693:Minkowski–Chauffard syndrome 956:10.3324/haematol.2009.008037 2010: 1814:Drug-induced nonautoimmune 1795:Thrombotic microangiopathy 1621:pyruvate kinase deficiency 658:(from an identical twin). 1800:Hemolytic–uremic syndrome 1712:Hereditary stomatocytosis 1700:Hereditary elliptocytosis 1089:10.1016/j.cca.2014.10.006 170:. Embryonic Hbs include: 57: 48: 1688:Hereditary spherocytosis 1255:10.5045/br.2015.50.4.194 501:Alkaline electrophoresis 385:Production abnormalities 313:, spontaneously or upon 259:Structural abnormalities 1893:Mean corpuscular volume 1857:Diamond–Blackfan anemia 1809:Drug-induced autoimmune 1744:Cold agglutinin disease 1550:Plummer–Vinson syndrome 1545:Iron-deficiency anemia 394: 357:Chemical abnormalities 1864:Pure red cell aplasia 1631:hexokinase deficiency 1209:Journal of Stem Cells 771:"Hemoglobin Variants" 392: 105:autosomal co-dominant 101:single-gene disorders 1869:Sideroblastic anemia 1677:Hemoglobin C disease 1563:Megaloblastic anemia 1305:10.1155/2016/6940283 1124:10.1093/bfgp/elac002 795:Huisman THJ (1996). 589:: Nitric oxide is a 549:Hemoglobin functions 516:Acid electrophoresis 1668:Sickle cell disease 495:gel electrophoresis 418:Hemoglobin variants 362:Methemoglobinemia: 337:variants can cause 143:tetrameric proteins 1955:Sulfhemoglobinemia 1408:External resources 801:Globin Gene Server 675:CDC (2019-02-08). 452:Hb Constant Spring 395: 44:Hemoglobinopathies 18:Hemoglobinopathies 1977: 1976: 1973: 1972: 1960:Reticulocytopenia 1950:Methemoglobinemia 1938: 1937: 1829: 1828: 1769: 1768: 1568:Pernicious anemia 1511: 1510: 1503:Polycythemia vera 1442: 1441: 1286:Mahla RS (2016). 1006:10.1002/ajh.21308 540:, in areas where 446:Hb G-Philadelphia 350:methemoglobinemia 116:alpha-thalassemia 95:, the protein of 82: 81: 30:Medical condition 16:(Redirected from 2001: 1727: 1641:hemoglobinopathy 1591: 1529: 1520: 1491: 1469: 1462: 1455: 1446: 1335: 1328: 1327: 1317: 1307: 1283: 1277: 1276: 1266: 1234: 1225: 1224: 1204: 1195: 1192: 1186: 1185: 1175: 1142: 1136: 1135: 1107: 1101: 1100: 1072: 1066: 1065: 1063: 1061: 1046: 1040: 1033: 1027: 1026: 1008: 984: 978: 977: 967: 950:(9): 1321–1322. 935: 926: 925: 915: 906:(5): 1977–1982. 891: 885: 884: 846: 840: 836: 830: 827: 821: 818: 812: 811: 809: 808: 792: 786: 785: 783: 782: 775:Lab Tests Online 767: 761: 760: 758: 757: 748:. Archived from 738: 732: 731: 721: 697: 691: 690: 688: 687: 672: 640:peripheral blood 611:conditions. The 510:sodium bisulfite 460:Hemoglobin Kenya 380:B) Quantitative 321:. Precipitated, 319:hemolytic anemia 315:oxidative stress 120:beta thalassemia 85:Hemoglobinopathy 78: 77: 53: 36:Hemoglobinopathy 33: 21: 2009: 2008: 2004: 2003: 2002: 2000: 1999: 1998: 1994:Blood disorders 1984: 1983: 1980: 1978: 1969: 1934: 1878: 1837: 1825: 1765: 1716: 1582: 1574: 1507: 1482: 1480:red blood cells 1473: 1443: 1438: 1437: 1403: 1402: 1346: 1332: 1331: 1285: 1284: 1280: 1236: 1235: 1228: 1206: 1205: 1198: 1193: 1189: 1144: 1143: 1139: 1109: 1108: 1104: 1074: 1073: 1069: 1059: 1057: 1048: 1047: 1043: 1034: 1030: 986: 985: 981: 937: 936: 929: 893: 892: 888: 873: 848: 847: 843: 837: 833: 828: 824: 819: 815: 806: 804: 794: 793: 789: 780: 778: 769: 768: 764: 755: 753: 740: 739: 735: 699: 698: 694: 685: 683: 674: 673: 669: 664: 633: 530: 518: 503: 491: 443:HbO (Hb O-Arab) 420: 387: 382: 359: 327:plasma membrane 317:, resulting in 261: 256: 254:A) Qualitative 251: 243: 239: 229: 225: 215: 211: 201: 197: 190: 186: 180: 176: 139: 97:red blood cells 89:blood disorders 72: 31: 28: 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1278: 1249:(4): 194–203. 1243:Blood Research 1226: 1215:(3): 163–197. 1196: 1187: 1137: 1118:(3): 159–176. 1102: 1067: 1041: 1028: 979: 927: 886: 871: 841: 831: 822: 813: 787: 762: 733: 712:(8): 704–712. 692: 666: 665: 663: 660: 644:umbilical cord 632: 629: 628: 627: 623: 616: 605: 595: 594: 583: 569:carbon dioxide 565: 529: 526: 517: 514: 502: 499: 490: 487: 486: 485: 482: 479: 478:Hb N-Baltimore 476: 473: 470: 467: 464: 461: 458: 455: 454: 453: 447: 444: 441: 436: 433: 430: 427: 419: 416: 415: 414: 413: 412: 409: 406: 386: 383: 381: 378: 377: 376: 375: 374: 367:Methaemoglobin 358: 355: 354: 353: 342: 334: 307: 260: 257: 255: 252: 250: 247: 246: 245: 241: 237: 231: 227: 223: 217: 213: 209: 205: 204: 203: 199: 195: 192: 188: 184: 181: 178: 174: 138: 135: 91:involving the 80: 79: 66: 60: 59: 55: 54: 46: 45: 42: 38: 37: 29: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2006: 1995: 1992: 1991: 1989: 1982: 1966: 1963: 1961: 1958: 1956: 1953: 1951: 1948: 1947: 1945: 1941: 1929: 1926: 1924: 1921: 1920: 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1613: 1602: 1495:Polycythemia 1426: 1415: 1391: 1380: 1365: 1350: 1295: 1291: 1281: 1246: 1242: 1212: 1208: 1190: 1155: 1151: 1140: 1115: 1111: 1105: 1080: 1076: 1070: 1058:. Retrieved 1053: 1050:"rs33948057" 1044: 1036: 1031: 996: 992: 982: 947: 943: 903: 899: 889: 854: 850: 844: 834: 825: 816: 805:. Retrieved 800: 790: 779:. Retrieved 774: 765: 754:. Retrieved 750:the original 745: 736: 709: 705: 695: 684:. Retrieved 680: 670: 634: 596: 587:nitric oxide 580:bicarbonates 548: 547: 531: 522: 519: 507: 504: 492: 421: 411:Beta (Minor) 408:Beta (Major) 396: 370: 331:Heinz bodies 297: 281:polycythemia 273:heterozygous 271:or compound 264:Hb variants: 263: 262: 160:Embryonic Hb 154: 140: 124: 112:thalassemias 109: 84: 83: 1928:hypochromic 1884:Blood tests 1646:Thalassemia 1604:enzymopathy 1533:Nutritional 1417:MedlinePlus 1158:: eAE5254. 999:(1): 55–8. 613:bone marrow 591:vasodilator 463:Hb Korle-Bu 457:Hb Hasharon 311:precipitate 304:polymerizes 99:. They are 41:Other names 1909:macrocytic 1904:microcytic 1899:normocytic 1862:Acquired: 1848:Hereditary 1615:glycolysis 1595:Hereditary 1393:DiseasesDB 1060:7 February 857:: 63–279. 807:2008-10-12 781:2008-10-12 756:2013-11-07 686:2019-05-05 662:References 652:allogeneic 648:autologous 631:Treatments 287:(HbS) and 269:homozygous 93:hemoglobin 69:Hematology 1580:Hemolytic 656:syngeneic 626:cyanotic. 559:from the 528:Evolution 472:Hb Kansas 466:Hb Lepore 435:Hb Bart's 371:increased 346:histidine 323:denatured 285:sickle Hb 277:hemolysis 127:pathology 64:Specialty 1988:Category 1838:(mostly 1835:Aplastic 1775:membrane 1722:Acquired 1683:membrane 1583:(mostly 1476:Diseases 1428:Orphanet 1324:27516776 1273:26770947 1221:25157450 1182:34909973 1152:Einstein 1132:35265979 1097:25314938 1083:: 50–7. 1023:29114149 1015:19006227 974:19734427 839:p.ch.48. 728:11545326 620:jaundice 573:hydrogen 339:cyanosis 220:Adult Hb 168:fetal Hb 107:traits. 1387:D006453 1315:4969512 1264:4705045 1173:8664291 965:2738729 922:7655024 881:2195851 719:2566499 609:hypoxic 564:oxygen. 542:malaria 484:Hb Pisa 481:Hb Hope 1840:normo- 1585:normo- 1559:Macro- 1541:Micro- 1524:Anemia 1422:001291 1322:  1312:  1271:  1261:  1219:  1180:  1170:  1130:  1095:  1021:  1013:  972:  962:  920:  879:  869:  726:  716:  602:Anemia 557:oxygen 150:moiety 131:anemia 71:  1943:Other 1672:trait 1661:delta 1651:alpha 1433:68364 1398:19674 1376:282.7 1361:D58.2 1054:dbSNP 1019:S2CID 900:Blood 642:, or 561:lungs 405:Alpha 293:assay 1731:AIHA 1656:beta 1382:MeSH 1371:9-CM 1320:PMID 1296:2016 1269:PMID 1217:PMID 1178:PMID 1128:PMID 1093:PMID 1062:2014 1011:PMID 970:PMID 918:PMID 877:PMID 867:ISBN 724:PMID 576:ions 449:HbH 234:HbA2 147:heme 118:and 1478:of 1367:ICD 1352:ICD 1310:PMC 1300:doi 1259:PMC 1251:doi 1168:PMC 1160:doi 1120:doi 1085:doi 1081:439 1001:doi 960:PMC 952:doi 908:doi 859:doi 714:PMC 475:HbJ 469:HbM 439:HbD 432:HbE 429:HbC 426:HbS 289:HbC 279:or 129:or 1990:: 1850:: 1561:: 1543:: 1431:: 1420:: 1396:: 1385:: 1374:: 1359:: 1356:10 1318:. 1308:. 1294:. 1290:. 1267:. 1257:. 1247:50 1245:. 1241:. 1229:^ 1211:. 1199:^ 1176:. 1166:. 1156:19 1154:. 1150:. 1126:. 1116:21 1114:. 1091:. 1079:. 1052:. 1017:. 1009:. 997:84 995:. 991:. 968:. 958:. 948:94 946:. 942:. 930:^ 916:. 904:86 902:. 898:. 875:. 865:. 855:40 853:. 799:. 773:. 744:. 722:. 710:79 708:. 704:. 679:. 551:: 512:. 497:. 244:). 230:). 216:). 122:. 1842:) 1685:: 1670:/ 1643:: 1606:: 1587:) 1516:↓ 1487:↑ 1468:e 1461:t 1454:v 1369:- 1354:- 1344:D 1326:. 1302:: 1275:. 1253:: 1223:. 1213:9 1184:. 1162:: 1134:. 1122:: 1099:. 1087:: 1064:. 1025:. 1003:: 976:. 954:: 924:. 910:: 883:. 861:: 810:. 784:. 759:. 730:. 689:. 622:. 352:. 333:. 242:2 240:δ 238:2 228:2 226:β 224:2 214:2 212:Îł 210:2 202:) 200:2 198:Îł 196:2 191:) 189:2 187:ε 185:2 179:2 177:ε 175:2 20:)

Index

Hemoglobinopathies

Specialty
Hematology
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blood disorders
hemoglobin
red blood cells
single-gene disorders
autosomal co-dominant
thalassemias
alpha-thalassemia
beta thalassemia
pathology
anemia
tetrameric proteins
heme
moiety
Embryonic Hb
embryogenesis
fetal Hb
Adult Hb
HbA2
homozygous
heterozygous
hemolysis
polycythemia
sickle Hb
HbC
assay

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